Charities are being offered a free guide that advises not-for-profit organisations on how to measure the impact of their work in tackling loneliness.
The 12-page guide, funded by the National Lottery Community Fund (formerly the Big Lottery Fund), includes a ready-to-use questionnaire template to help organisations assess the effectiveness of their work.
The government pledged £20m in June last year for voluntary organisations to help reduce loneliness.
Prime Minister Theresa May launched the first cross-government strategy on loneliness in October.
The strategy says all GPs in England can refer patients experiencing loneliness to voluntary services.
The centre said in a statement that the guide "takes a realistic approach to evaluation to avoid overloading charities and the people they support with too many questions".
The guide is aimed predominantly at staff responsible for evaluation and monitoring impact.
The National Lottery Community Fund awarded the centre £1.5m last year to support its work over the next three years to help charities make better use of evidence to improve wellbeing.
Based in London, it works with researchers, voluntary organisations, businesses and government to bring together evidence on the impact of wellbeing projects.
The guide can be downloaded here.